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And so, after a little time, he went on as before, studying "by ear-work," and turning off upon his noctograph from ten to fifteen pages every day.

It was a contrivance called "the noctograph," meant for the use of the blind.

A person using the noctograph wrote with a sort of stylus of ivory, agate, or some other hard substance upon the blackened paper, which conveyed the impression to the white paper underneath.

Prescott then placed his noctograph upon the floor and lay down flat beside it, writing in this attitude for many hours on nine consecutive days rather than give in.

Of his noctograph Prescott made constant use.